Senior Full Stack Developer

Description

About the Role

We are looking for a Senior Full Stack Developer to join a CommIT team delivering mission-critical systems for a leading financial institution. You will own features end-to-end across the full stack, working in a secure, highly regulated banking environment where reliability, code quality, and disciplined process matter as much as speed.

This is a hands-on senior role on a layered enterprise architecture. You will be expected to operate confidently across all tiers - from the React client through to the core banking integration - and to raise the engineering bar for the team. We build with modern, AI-assisted workflows, so developers who are fluent with tools like Cursor and Claude Code will feel at home.

Architecture at a Glance

You will design and build across a layered banking architecture, understanding the responsibilities and boundaries of each tier and how data and transactions flow through them:

Client (React | React Native) → BFF (Nest.js / JavaScript) → Middleware (.NET / C#) → Core Banking

Key Responsibilities

• Design, build, and maintain full-stack features end-to-end across the client, BFF, and middleware tiers.
• Develop responsive, accessible UIs in React and build the Backend-for-Frontend layer in Nest.js / Type script.
• Integrate middleware services in .NET / C#, connecting to core banking systems and third-party financial APIs.
• Write secure, well-tested, maintainable code, with unit and integration test coverage as part of the definition of done.
• Work within the bank's SDLC and governance - change management, environment promotion, security and compliance gates, code review, and release control.
• Participate in design discussions and code reviews; mentor team members and improve engineering practices.
• Collaborate with product, QA, architects, and the client's teams in a delivery-focused, client-facing setting.

Requirements

Must-Have Qualifications

• 5+ years of professional full-stack development experience.
• Front-end: strong React and React Native, including modern patterns, state management, and component architecture.
• BFF / JavaScript: hands-on experience building Backend-for-Frontend layers with Nest.js (Node / JavaScript / TypeScript).
• Layered architecture: proven experience designing and developing across a Client → BFF → Middleware → Core structure, with a clear grasp of each tier's responsibilities and boundaries.
• Regulated SDLC: experience working within a bank's (or comparable regulated enterprise's) software development lifecycle - formal change management, security and compliance gates, and release governance.
• Testing: strong testing discipline with hands-on unit and integration testing using Jest (JS/TS).
• Fundamentals: REST APIs, relational databases (e.g. SQL Server / Oracle / PostgreSQL), Git, and CI/CD pipelines.
• Messaging / event-driven: hands-on experience with messaging and event-streaming tools such as RabbitMQ and Kafka, and asynchronous integration patterns between services.
• State machines: deep knowledge of state machine design and implementation for modeling complex, multi-step workflows and transaction lifecycles.
• Security mindset: writes with security and data sensitivity front of mind, appropriate to a banking context.
• Communication: strong verbal and written English; effective in a collaborative, client-facing delivery environment.

Advantages

• Middleware: .NET / C# development, building services and integrations.

• Banking / financial domain depth - prior experience with core banking, payments, or other financial systems.
• AI-assisted development - hands-on experience with tools such as Cursor or Claude Code (ideally 1+ year). A meaningful plus on this team.
• Cloud & modern infra - AWS, microservices, containers (Docker / Kubernetes).
• Local context - familiarity with the Israeli banking landscape and Hebrew.